Telephone-receiver.



0 ADAMS-RANDALL. TELEPHONE RECEIVER. APPLICATION FILED FEB.28, 1912.

Patented Nov. 12,1912.

it] GHA RILES ADAMS-EANDALL, (9F B$TON, TVKA$SB-CH.U$ETTS.

TELEPHONE KECEXVEE.

v Specification of Letters 'Batent. 1P atitfin' i fitli l l @Wt 123 this no. esets-z.

1912. serial Lill lthfiei'i. I

Application-nice February 28, 1th alt 'aiahom it may concern: are interposecl in said series nncl clamped in Q 3e it known that l, CHARLES ADAMS-RAN position by the screws 11.; the poles of new, a citizen oi the United States, residing Stild pieces 12 extending sui e-cent to the as t B0 on, n the county of fiufiolk an hragin and being pro iclecl with the o itate 0t M ssachusetts, e invented cerusual helices 14rfor connection to the maintain new a d uset'ul Imp ovemen ele line circuit. 5.5 hone'Receivers; end o hereby cleclere This improveo construction sncl arrange the following to a iu'll, clear, and also ment of the permanent magnets and soft {lescription o the invention, such as Wil iron pole pieces provides a compact en mi enable others skillecl in the artto which it ventegeous structure of: high magnetic a :pei'tains to make an use the same. ower, \vl ich is adepteci to he remli y Ll- 60 My invention relates 0 ani prove l tele- 'usterl to the position of highest efficiency )hone receiver and it onsists n the conrelative v to the receiver ciiaphregm. structions, combinations, and a renge'rnen s l have illustrated preteire ftlltl setistav ribe a claim tory construction bu changes eoulcl he metle t proviiie it within the spirit anl scope ot my invention. 65

'm I claim 1 eiver, the combine-- telephone rec eetl series (it curved permanent )rted in pairs with the similar ioles of the several pairs slightly separated '70 and lying in a common plane, suit iron pole oiec-es interposed hetiveen certain ct sai pairs oi magnets and overlapping the adjeoles of the latter, a

' oi'i me nets anti 7 5 herein lesc l; in :1 tion of a spa magnets suppn eoiusting the to the diaphragm;

.ln the accompanying drawings, forming iert of this application, and in which similar reference symhols indicate miiearts in the several viewsiltigi (tr vertical. axial section on the line oii lig. 2, illustrating one e W is a i phrzigin.

. in e telephon n internsi w phregin therein it rin screw, casing ior clamping n hregm in @051 tion, it he eiljustnhly 'screweo.

snicl casing, it nent magnets sup insatiable closur several piiirs sligh ly separates. a common plane, soft iron 'iole nice in said series anti overlzipp i r poles o't seiil pairs ct i s for inching snicl hsclr ciosure in Sifiti positions; j wherech "l J" .r n signeture, in "presence "we witnesses.

" ill)rllviS'RhllDALL.

ot my invention; it 1 line 2 2 of Fi l; and Fig. 3 is an enleig perspective view of one of magnets.

Referring to the drawings, 1 ini'licstes s, e internal r l at Q to adedecl heck closure of nonmagn i means, su i as v A being 'provi or looking iustecl positions.

desire ns it on a suitable suppo' (liephregm 'Z clempe in pos' n between was 8 (it suiteble material, such as paper, b a rim" 9 screwe within seirl case A spaced. series of. permanent magnets 10, r horseshoe term, (ire shown. cliustnhle closure 3 by screws in dupliets losing arrange poles of the W itnesses'.

J/isrnn 1i. henn M, ii. Donne'rr.

cote pairs several parts slightly separ a commoi So no 

